You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you?

USER: Cynthia Adams here, I want to book a flight ticket from Houston to Philadelphia.

ASSISTANT: Sure. May I know your journey dates?

USER: My journey dates are 12 June and 14 June.

ASSISTANT: Can I know your airport codes?

USER: Sure, my airport codes are IAH to PHL.

ASSISTANT: In which class do you want to travel?

USER: No, any class is ok for me.

ASSISTANT: Please provide me your depart time and arrival time.

USER: Any time is comfortable for me.

ASSISTANT: You have a flight 1022 in Frontier airline and price 100 with a class. Shall I proceed?

USER: Sure, you can proceed  with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.