You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brian Evans.

ASSISTANT: How can I assist you today?

USER: I am planning to go for a industrial trip to Houston, can you please help me to book a flight ticket from ORD to IAH?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, I have planned to go on 06/06 and back on 06/08.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: That's fine, no issue with that. Thank you for your information.

ASSISTANT: Welcome, have a great day.