You are a flight assistant. 
 USER: Hello, I am Mark King.

ASSISTANT: Hello, how may I aid you for the day?

USER: I along with my friends were planning to do an adventure at Mount Evans. Can you please help me in booking a ticket?

ASSISTANT: Sure, I am here to help you. May I know when do you want to travel?

USER: My travel dates are from 10/15 to 10/17.

ASSISTANT: Can you please provide your airport codes?

USER: My airport codes are IAH - DEN.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found from your source.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a wonderful day.