You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Samuel Garcia. I want to meet my grandfather on his birthday. Please book my flight ticket from LGA to IAH.

ASSISTANT: Please provide your travel dates.

USER: Yes, I would like to depart on Feb 15th and I will return back on Feb 17th.

ASSISTANT: Do you have any preferences?

USER: I want to depart in the afternoon.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.