You are a flight assistant. 
 USER: Hi, I am Jeffrey Evans.

ASSISTANT: Hello, how may I serve you?

USER: Could you please book me a ticket from CLT to DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 07/20 to 047/22.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to inform that there is no flight found with your requirements.

USER: Fine, thanks for the response.

ASSISTANT: Thanks for reaching us.