You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, good morning. How can I help you?

USER: I am Jacob Clark. I like to travel from IAH to LAS, can you help in booking a ticket?

ASSISTANT: May I know your travel dates?

USER: I like to travel on 03/13 to 03/15.

ASSISTANT: There is no flight available on 03/13 to LAS.

USER: That's ok. Thank you for your help.

ASSISTANT: Thanks for choosing us.