You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Gregory Thomas.

ASSISTANT: How may I assist you?. Nice to meet you Gregory.

USER: I am planning to meet my grandparents at Denver, can you please book me a ticket from ATL to DEN?

ASSISTANT: Sure, can you share your travel dates please?

USER: My planned dates of journey are from 05/01 to 05/03.

ASSISTANT: Thanks for waiting. But I am sorry to say that presently there are no flights available.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you.