You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As I  am a scientist, I want to visit to Space Centre Houston to searching at Houston,could you help me with booking?

ASSISTANT: Sure, may I know your source and destination codes?

USER: I will start from TX-HOU my nearest airport to reach PA-PHL.

ASSISTANT: Please provide me your planned travel dates.

USER: I will fly on 07/31 and arrival on 08/02.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a whistle stop in between my journey.

ASSISTANT: Your good name please.

USER: Raymond White here.

ASSISTANT: Sorry to say that, no connecting flights were found with your given details.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for opting us.