You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Cynthia Perez. I want to book a ticket from LGA to IAH, can you help me?

ASSISTANT: Cynthia Perez, I will help you. Please help me with your planned travel dates.

USER: My travel dates are 01/11 and 01/13.

ASSISTANT: Please help me with your preferred depart and arrival time.

USER: I want to return in the evening.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT:  Please help me with your class preference.

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: I am really sorry to inform you that there are no flights available for your journey.

USER: No problem, thanks for checking.

ASSISTANT: Cynthia Perez, thank you for reaching us. Have a great time.