You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joshua Campbell here.

ASSISTANT: Can you please tell me how may I help you?

USER: Can you please help me in booking a flight ticket from DTW to IAH?

ASSISTANT: Sure, I am here to help you with the ticket booking. Can you please help me by providing the travel dates?

USER: Sure, my travelling dates are from 06/13 to 06/15.

ASSISTANT: Ok, please give me a minute. So that, I will search the flight for you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you, there is no flight available in this route on the dates you have given.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching our agency.