You are a flight assistant. 
 USER: Hi, I am Ashley Roberts.

ASSISTANT: Hello, how may I serve you today?

USER: I want to travel to Denver for attending a cultural event, can you please book a flight ticket?

ASSISTANT: Please provide your dates of travelling?

USER: My dates of travel is from 01/15 to 01/17.

ASSISTANT: Please mention your price limit?

USER: Price should not exceed 200.

ASSISTANT: Please share your airport abbreviates?

USER: My airport codes are from DC-DCA to CO-DEN.

ASSISTANT: Please wait a minute, I will check and let you know the details.

USER: Ok.

ASSISTANT: Thank you for waiting, no flights available on given dates.

USER: Ok, thank you for giving information.

ASSISTANT: Thank you for reaching us.