You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Tell me how can I help you?

USER:  I want to book a flight for my grandfather. He is coming from LAS to meet me in HOU. So please can you check for the flight availability?

ASSISTANT: Sure, can I know the travel dates please?

USER: I want to fly on 03/06 and back on 03/08.

ASSISTANT: May I know your grandfather name please?

USER: My grandfather name is Elizabeth Walker.

ASSISTANT: Sorry, there are no flights as per your request.

USER: That's alright, no problem. Thank you so much.

ASSISTANT: You are welcome.

USER: Most welcome.

ASSISTANT: Thanks for reaching us.