You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please book me a ticket with direct flight to attend an emergency surgery.

ASSISTANT: Sure, may I know when you want to travel?

USER: I will travel on 05/11.

ASSISTANT: Ok, please share your journey codes to proceed further.

USER: My source point is New York, LGA and destination is Houston, IAH.

ASSISTANT: Can I know your return date please?

USER: 05/13 is my return date.

ASSISTANT: Ok, may I know your name please?

USER: My name is Kevin Thompson.

ASSISTANT: Thank you, sorry to say no flights found with your details.

USER: It's ok. Thank you for your response.

ASSISTANT: Thank you for reaching us, have a nice day.