You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Lisa Nelson here. I'm planning to visit Houston, can you please book a ticket from JFK to IAH?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my planned departure and return travel dates are 27th and 29th of July.

ASSISTANT: Do you have any requirements?

USER: Yes, my ticket fare doesn't exceeds 200.

ASSISTANT: Sorry to say, there is no flight as per your requirements.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.