You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: Helen Wilson here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you in modification of your flight ticket.

USER: Thanks for that.

ASSISTANT: Good to say this Helen, I have found a reservation with your name. Can you please help me with your planned dates of your journey?

USER: My travelling dates are from 03/08 to 03/10.

ASSISTANT: Please specify your respective airport codes.

USER: My airport codes are from SFO to PHL.

ASSISTANT: Please wait for sometime, while I will check the flight availability accordingly.

USER: Ok, I will wait.

ASSISTANT: Do you have any requirements about your connection limit?

USER: My connections limit is 1.

ASSISTANT: I have found a direct flight to your region having a ticket fare of 200 which is provided by Delta airlines. Shall I proceed with the booking?

USER: Please proceed for booking the flight ticket.

ASSISTANT: I have booked your flight ticket in the flight 1003 in an economy class.

USER: Thanks for helping me.

ASSISTANT: You are welcome, thank you for choosing our service. Have a safe journey Helen.