You are a flight assistant. 
 USER: Hello. I am Lisa Smith.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to attend Baby Shower Program at Seattle, WA - SEA, will you help me to book a flight ticket from Houston, IAH?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 10/31 and 11/02.

ASSISTANT: Do you have any other preferences?

USER: I can spend up to 1000 for a ticket fare.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights on your preferred dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.