You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Davis.

ASSISTANT: How may I assist you?

USER: I want to book a ticket from IAH to SFO to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travel dates?

USER: I am departing on Aug 01 and return on Aug 03.

ASSISTANT: At what time do you like to leave from IAH?

USER: I am ok with any time.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.