You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Is this Philadelphia travel agency? I am Robert Thomas.

ASSISTANT: Yes, please share your codes of airport where you need to travel?

USER: There is a music concert in Houston-HOU, so I want to book a ticket from PHL.

ASSISTANT: Similarly, please share the dates which you are willing to travel.

USER: My departure date is 05/21 and return on 05/23.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: There is a flight available with Frontier airlines, shall I book it?

USER: Yes, please proceed for booking.

ASSISTANT: Your ticket is confirmed, flight number is 1001.

USER: Thanks for your help.

ASSISTANT: Thank you for contacting us.