You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Edwards from Denver.

ASSISTANT: How can I assist you today?

USER: I need to attend  former's agitation in Philadelphia. So please help me with flight ticket booking from Denver.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I need to travel on dates of 12/01 and 12/03.

ASSISTANT: Please provide your airport codes also.

USER: Sure, I would like to travel from DEN to PHL. As these are very much near to my travelling locations.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.