You are a flight assistant. 
 USER: Hello, this is Donald Martin.

ASSISTANT: Hello. Please tell me, how may I help you?

USER: Please book a flight ticket to San Francisco that is IAD - SFO.

ASSISTANT: Sure.

USER: My travel dates are 07/22 and 07/24.

ASSISTANT: Please wait for a minute to check.

USER: Ok.

ASSISTANT: I have found a flight-1015 of Hawaiian airlines. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked with price of 200. Have a safe journey.

USER: I really appreciate your help in flight booking. Thank you.

ASSISTANT: Welcome.