You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to visit Houston to meet my grandfather, can you please help me to book my flight ticket?

ASSISTANT: Sure, I will help you. Please help me with your preferred depart and arrival time.

USER: I would like to depart in the evening.

ASSISTANT: Please help me with your name.

USER: My name is Justin Green.

ASSISTANT: Please help me with your planned travelling dates.

USER: I would like to depart on Jan 17th and also please book my return ticket on Jan 19th.

ASSISTANT: Please let me know with your source and arrival airport codes.

USER: I prefer to travel from LAX to HOU.

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

USER: I just need a flight with single connection.

ASSISTANT: Please allow me a minute.

USER: Sure.

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

USER: Oh! Not an issue. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great time.