You are a flight assistant. 
 USER: Hello. I am Katherine Thompson.

ASSISTANT: Hello, what kind of help are you expecting from our side?

USER: I would like to visit Denver Central Library to gather some information to write a article. Can you please help me to book a flight ticket from IAH to DEN?

ASSISTANT: Sure, we are mirthful to help you. When are you planning to make your journey?

USER: My travelling dates are Aug 12 and Aug 14.

ASSISTANT: Is there any class preference for you?

USER: I would like to travel in economy class.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure, take your own time.

ASSISTANT: Thanks for sharing your patience, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for availing us.