You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Matthew Wilson.

ASSISTANT: How can I help you today?

USER: I would like to visit Houston, can you help me for booking a flight ticket from IAH to HOU?

ASSISTANT: Sure, I am here to help you in booking. Can I have your travel dates?

USER: My travelling dates are 04/26 and 04/28.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us, have a great day.