You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit Houston Zoo with my children, can you help me with booking from ORD to IAH?

ASSISTANT: Sure, may I know the planned travel dates?

USER: My travel dates are Jan 30 and Feb 01.

ASSISTANT: Please provide me the specifications.

USER: I want to travel in economy class flight.

ASSISTANT: May I know your name?

USER: I am Sandra Martin.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.