You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jennifer Clark. Can you please book a flight ticket from DEN to LGA?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, I need to travel on dates of 06/30 and 07/02.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.

USER: Most welcome.