You are a flight assistant. 
 USER: Hi, I am Richard Lee.

ASSISTANT: Hello. How may I aid you today?

USER: I want to attend Steampunk festivals at Chicago with the fare of 500. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, please let me know your planned travelling dates to proceed further.

USER: I have planned on 05/10 and return on 05/12.

ASSISTANT: Can I know your source and destination points?

USER: My destination is at Chicago, IL - ORD. My source is from San Francisco, CA - SFO.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: We are unable to provide flight  in between your journey points due to heavy floods at Chicago.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your response.