You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Mark Jones, please look for the availability of flight tickets from DCA to LGA.

ASSISTANT: Jones, could you please help me with your dates of trip for booking a ticket?

USER: Search the tickets on the dates 01/31 and 02/02.

ASSISTANT: Jones, please wait for a moment to check the available ticket for you.

USER: Ok, take your time, I will be waiting.

ASSISTANT: Sorry Jones, there is no flight is available as per your travelling details.

USER: Ok, no issues, its not very urgent, I will look after some days.

ASSISTANT: Sure. Thank you for your information providing.

USER: Thank you for your service.

ASSISTANT: You are welcome.