You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER:  I am Melissa Garcia.

ASSISTANT: Ok.

USER: I would like to book a flight ticket from Houston TX-IAH, to celebrate my friend's birthday in Minneapolis & St Paul MN-MSP. Can you please help me?

ASSISTANT: Sure, I can help you in doing that. On which dates would you like me to book a flight ticket for you?

USER: I would like to depart on 07/15 and arrive on 07/17.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no issues.

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

USER: Thank you.