You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Myself Brenda Allen. I am planning to visit Denver, will you help me in booking the flight ticket from LGA?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My travelling dates are May 07 and May 09.

ASSISTANT: Do you prefer economy or business class in your journey?

USER: I am comfortable in any class.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry we did not find any flights matching your journey dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for helping me.