You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Helen Turner here, can you help me finding flights with connection 1?

ASSISTANT: Sure Turner, I can help you with that.

USER: Thank you.

ASSISTANT: May I know your travelling airport codes to find a flight for you?

USER: My travelling airport codes are DCA to DFW.

ASSISTANT: Ok, please mention your trip dates to go.

USER: I am going to start my journey on 07/11 and I am going to return on 07/13.

ASSISTANT: Please wait a moment, let me check the availability.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry for the inconvenience, based on your request there is no flight for you.

USER: So sad for that. Thank you for your services.

ASSISTANT: Ok, thanks for contacting us.