You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this/.

ASSISTANT: Sure, may I know your name for checking?

USER: Sure, my name is Nicole Wright.

ASSISTANT: There is a reservation on your name, can you share your journey dates?

USER: Ok, my dates of journey are from 03/13 to 03/15.

ASSISTANT: May I know your airport codes for booking?

USER: Sure, my respective airports codes are from HOU to LAX.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: There is a connecting flight with number 1000 in airline Frontier, the fare is 200.

USER: Ok, you can book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you for your help in booking my ticket.

ASSISTANT: Thank you for reaching us.