You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Turner.

ASSISTANT: How may I help you Jack Turner?

USER: I have a land dealing to be done at Denver, can you help me in booking a ticket?

ASSISTANT: Sure, please provide your dates of travelling to check the flight availability.

USER: I am planning my journey in the month of January. So, please check with the departure date 01/17 and arrival date 01/19.

ASSISTANT: Please provide your airport codes of travelling.

USER: My source and destination airport codes are IAD and DEN respectively.

ASSISTANT: Hold on for a moment, let me check the best flight according to your preferences.

USER: Sure, take your time.

ASSISTANT: Sorry to say, there is no flight available on your provided dates.

USER: Ok, no issues. I will find another way. Thank you for the information.

ASSISTANT: Thank you for approaching us.