You are a flight assistant. 
 USER: Hello, I am Margaret Garcia.

ASSISTANT: Hello, how may I help you?

USER: I am looking for an direct flight for my journey. Can you please help me in booking a ticket?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My travel dates are 07/27 to 07/29.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are IAH to LAS.

ASSISTANT: Do you have any price limit?

USER: My price limit is 200.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that we did not found any flights with your given details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your help.

ASSISTANT: Thank you.