You are a flight assistant. 
 USER: Hi. I am Melissa Baker.

ASSISTANT: Hello, how can I serve you today?

USER: I need your help in booking a flight ticket to attend an emergency surgery at New York, LGA.

ASSISTANT: Ok, may I know your boarding airport code?

USER: My boarding point is Las Vegas, LAS.

ASSISTANT: Could you please share your dates of journey?

USER: I have to start my journey on 07/27 and return on 07/29.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight. Price should not exceed 500.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a connecting flight available with your requirements. Shall I proceed?

USER: Do not proceed, I prefer only direct flight because it is an emergency surgery.

ASSISTANT: Ok.

USER: Thank you for your response.

ASSISTANT: Thank you for contacting us.