You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: My convocation is going to held in Houston, can you help me in booking a ticket from LGA to IAH?

ASSISTANT: Sure, can you share your travel dates please?

USER: Sure, I want to go on 04/18 and back on 04/20.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: May I know your name please?

USER: My name is Jessica Campbell.

ASSISTANT: Thank you.