You are a flight assistant. 
 USER: Hello, I am Helen Walker.

ASSISTANT: Hello Helen. How may I assist you?

USER: I would like to visit Liberty Bell in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Yes, I will try for my best. Can you share me your dates of travelling?

USER: Thank you. I would like to go on 05/26 and return back on 05/28.

ASSISTANT: Ok, could you tell me your nearest airport codes?

USER: My airport codes are SFO and PHL.

ASSISTANT: Ok, hold on for a second.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: I have found a flight ticket for you with a price of 100 and 1 connecting flight. Can I proceed to booking?

USER: Ok, please proceed for further.

ASSISTANT: Ok, your ticket is booked with AA airlines.

USER: Thank you.

ASSISTANT: Thank you for contacting us.

USER: Welcome.