You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Thomas.

ASSISTANT: How may I guide you today?

USER: Can you please book me a ticket from HOU to LGA?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My planned trip dates are May 23rd and May 25th.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight with a fare of 5000.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your help.