You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am planning to travel from IAH to DEN.

ASSISTANT: May I know your trip dates?

USER: My date of travelling is on 04/02 to 04/04.

ASSISTANT: Sorry to say this, there is no flight found basis on your details.

USER: That's ok.

ASSISTANT: May I know your name please?

USER: I am David Turner. Thank you.

ASSISTANT: Thank you for reaching us.