You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am looking for a direct flight for my journey, can you please find out a flight for me?

ASSISTANT: Sure, may I know your airport codes?

USER: Ok, I want to travel from IAH to LGA.

ASSISTANT: Can you please share me your good name?

USER: Sure, my name is Sharon Mitchell.

ASSISTANT: Please mention your travelling dates.

USER: My departure is on Jan 14 and please book my return ticket on Jan 16.

ASSISTANT: May I know your class preference?

USER: I don't have any class preference.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: There is no flight found with your given details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for availing us.