You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you with today?

USER: I want to meet my friend on this birthday can you please  book a ticket  for me?

ASSISTANT: Sure, may I know your name to proceed further?

USER: I am Barbara Jones.

ASSISTANT: Can you please me help me with the source and the destination codes?

USER: Source is from Charlotte,NC-CLT to Houston, TX-HOU.

ASSISTANT: Could you please help me with travelling dates?

USER: My specific dates are depature on 05/05 and return on 05/07.

ASSISTANT: Let me check that for you.

USER: OK.

ASSISTANT: There is a flight available at your request. Can I confirm the booking? I'm sorry to inform you that there is no flight available at your request.

USER: OK,Thank you.

ASSISTANT: You are welcome. Thank you for contacting us.